单项选择题
A user reports sporadic connectivity with their wireless connection. A technician determines the
wireless speed reported by the laptop to be 1Mbps.
Which of the following is the MOST likely cause of this issue?（）
A. The client does not support 802.11n
B. Incorrect frequency on the client is being used
C. Incorrect encryption on the AP
D. The client distance from the AP
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At which of the following layers does the ICMP protocol operate?（）
A.Layer 1
B.Layer 3
C.Layer 4
D.Layer 5 -
单项选择题
Which of the following security devices would MOST likely be used on a network to screen and prevent malicious traffic?（）
A.IDS
B.VPN
C.NIPS
D.HIDS -
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Which of the following is an intelligent repeater that is aware of the MAC addresses of the nodeson either side of the data link?（）
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